Java 代码

import java.util.Scanner;

public class Main
{
    public static boolean isOrigin(double x, double y)
    {
        return x == 0 && y == 0;
    }

    public static boolean isOnX(double x, double y)
    {
        return x != 0 && y == 0;
    }

    public static boolean isOnY(double x, double y)
    {
        return x == 0 && y != 0;
    }

    public static boolean isQ1(double x, double y)
    {
        return x > 0 && y > 0;
    }

    public static boolean isQ2(double x, double y)
    {
        return x < 0 && y > 0;
    }

    public static boolean isQ3(double x, double y)
    {
        return x < 0 && y < 0;
    }

    public static boolean isQ4(double x, double y)
    {
        return x > 0 && y < 0;
    }

    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);

        double x = cin.nextDouble();
        double y = cin.nextDouble();

        if (isOrigin (x, y))
            System.out.println ("Origem");
        else if (isOnX (x, y))
            System.out.println ("Eixo X");
        else if (isOnY (x, y))
            System.out.println ("Eixo Y");
        else if (isQ1 (x, y))
            System.out.println ("Q1");
        else if (isQ2 (x, y))
            System.out.println ("Q2");   
        else if (isQ3 (x, y))
            System.out.println ("Q3");
        else if (isQ4 (x, y))
            System.out.println ("Q4");
    }
}